IR spectra recorded during the TPD of pure CH₃NH₂ ice, zoomed in on key spectral bands. Lower panel: spectra of the ice at 3 K (red), 120 K (blue), and 160 K (brown). Upper panel: IR spectra of the desorbing species as deposited in an Ar matrix. The species were accumulated in the Ar matrix between 175 K and 220 K (green), 175 K and 260 K (purple), and 175 K and 300 K (orange).